*{
    padding: 0;
    margin: 0;
    list-style: none;
    box-sizing: border-box;
}
html,body,#app{
    height: 100%;
}
#app{
    display: flex;
    flex-direction: column;
}
.container {
    height: calc(100% - 44px);
    // background-color: pink;
    display: flex;
    flex-direction: column;

    &>header {
        height: 44px;
        background-color: yellowgreen;
    }

    &>main {
        // background-color: hotpink;
        flex: 1;
        overflow-y: auto;
    }
}
footer{
    height: 44px;
}